#4 It depends on the jurisdiction. In Washington, it's 12 in superior court, 6 in district court at the state level. Some states require 8, 9, etc. It's not the same everywhere, except that I would imagine the federal courts are the same regardless of the jurisdiction. Each court would likely have its own local court rules on procedure, filing, etc., but I would think that federal courts would be the same. Otherwise, unless they violate state or federal constiutional provisions, states may be free to set whatever number they want, within reason.
#5 Depends on the case. Just remember...will litigate for cigars.